Cook noodles according to package directions, omitting salt and fat.
Rinse scallops, and pat dry with paper towels.
Place a large nonstick skillet coated with cooking spray over medium heat until hot. Add scallops, shrimp, seasoning, and garlic; cook 5 minutes, stirring frequently, or until shrimp and scallops are done. Add half-and-half, yogurt spread, and green onions. Remove from heat. Add noodles and cheese, tossing to coat.